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Fig. 4B. —Results of statistical analysis of three radiologists shown as mean (•) ± 2 SD (whiskers). A, B, and C are qualified radiologists. Radiologist A is highly experienced in 3D building, B and C are not. Br = conventional virtual bronchoscopy, PA = enhanced virtual bronchoscopy using pulmonary artery. Graph shows no significant difference among three radiologists regarding limit of bronchial order, average of which was 7.5. Significant difference was found between radiologist A and other two radiologists regarding limit of pulmonary arterial order: 11.8 order, radiologist A; 9.8 order, radiologist B; and 9.2 order, radiologist C.